Which of the following reagents gives a yellow precipitate with a hot faintly acidic solution of `Bi^(3+)` ions?

Options

A. Ammonia solution (excess)
B. Freshly prepared 10% solution of pyrogallol
C. Potassium iodide solution
D. Freshly prepared `0.125M` alkaline sodium tetrahydroxidostannate (II) solution

Answer

B

Explanation

`Bi^(3+) + underset(("Pyrogallol"))(C_(6)H_(3)(OH)_(3)) rarr underset("Yellow ppt.of bismuth pyrogallate")(Bi(C_(6)H_(3)O_(3))darr)+3H^(+)`